JP7201575B2 - Exhaust heat recovery device - Google Patents

Exhaust heat recovery device Download PDF

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JP7201575B2
JP7201575B2 JP2019220968A JP2019220968A JP7201575B2 JP 7201575 B2 JP7201575 B2 JP 7201575B2 JP 2019220968 A JP2019220968 A JP 2019220968A JP 2019220968 A JP2019220968 A JP 2019220968A JP 7201575 B2 JP7201575 B2 JP 7201575B2
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exhaust
gas
flow path
heat exchange
exhaust gas
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JP2021088981A (en
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史朗 中嶋
洋輔 ▲高▼田
真由美 山中
徹 久永
勝文 井上
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Marelli Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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Description

本発明は、自動車の内燃機関に用いられる排気熱回収装置に関し、特に、排ガス再循環装置（ＥＧＲ）を備えた内燃機関に用いて好適な排気熱回収装置に係る。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust heat recovery system used in an internal combustion engine of an automobile, and more particularly to an exhaust heat recovery system suitable for use in an internal combustion engine equipped with an exhaust gas recirculation system (EGR).

この種の排気熱回収装置として、特許文献１に開示されたものがある。この特許文献１に開示された排気熱回収装置は、内燃機関の排ガスを導入する主排気流路と、この主排気流路から分岐して該主排気流路に合流する迂回流路と、この迂回流路に介装され、該迂回流路内の排ガスを導入して冷却媒体と熱交換を行う熱交換器と、この熱交換器の下流側で主排気流路及び迂回流路を開閉する弁部材と、を備え、この弁部材と熱交換器との間の迂回流路を、再循環流路を介して排ガス再循環装置（ＥＧＲ）に連通接続するように構成されている。また、弁装置は、アクチュエータにより駆動するようになっている。 As this type of exhaust heat recovery device, there is one disclosed in Patent Document 1. The exhaust heat recovery device disclosed in Patent Document 1 includes a main exhaust passage for introducing exhaust gas from an internal combustion engine, a detour passage branching from the main exhaust passage and joining the main exhaust passage, and A heat exchanger that is interposed in the detour channel and introduces the exhaust gas in the detour channel to exchange heat with the cooling medium, and a downstream side of the heat exchanger that opens and closes the main exhaust channel and the detour channel. a valve member configured to communicatively connect a bypass flow path between the valve member and the heat exchanger to an exhaust gas recirculation system (EGR) via a recirculation flow path. Also, the valve device is driven by an actuator.

特開２０１６－４４６６６号公報JP 2016-44666 A

前記従来の排気熱回収装置では、主排気流路と迂回流路の排ガスの流れを単一の弁部材で行うが、迂回流路の排ガスの流れを制御する部材が迂回流路に入り込む形状になっているため、迂回流路側にスペースが必要不可欠となり、その分装置全体が大型になる。 In the conventional exhaust heat recovery device, the flow of exhaust gas in the main exhaust passage and the bypass passage is performed by a single valve member, but the member for controlling the flow of the exhaust gas in the bypass passage is shaped so as to enter the bypass passage. Therefore, a space is indispensable on the side of the detour channel, and the entire apparatus becomes large accordingly.

また、主排気流路と熱交換器を含む迂回流路が並行に配置されているため、車両の前後方向の寸法が大きくなり、装置全体が大型になって車両の搭載性が課題になる。 In addition, since the main exhaust flow path and the detour flow path including the heat exchanger are arranged in parallel, the size of the vehicle in the front-rear direction increases, and the overall size of the device becomes large, which poses a problem of mounting on the vehicle.

そこで、本発明は、前記した課題を解決すべくなされたものであり、車両の搭載性に優れた小型の排気熱回収装置を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a small-sized exhaust heat recovery system which is excellent in mountability on a vehicle.

本発明は、排ガスが流れる上流側の排気管と下流側の排気管にそれぞれ接続される排気熱回収装置において、前記排ガスと熱交換を行う冷却媒体が循環する冷却媒体流路と、前記排ガスの熱交換流路と、を有する熱交換部と、前記排ガスを上流側の排気管から前記熱交換部に流れずに前記下流側の排気管から流れる主排気流路を形成する主排気流路部と、前記排ガスを前記熱交換流路から吸気側の排ガス再循環装置側に流す再循環流路を形成するＥＧＲ配管と、前記熱交換流路と前記主排気流路とに前記排ガスを振り分ける切換えバルブと、を備え、前記熱交換部に前記冷却媒体流路接続用の冷却媒体入口管と冷却媒体出口管がそれぞれ設けられ、前記冷却媒体入口管と前記冷却媒体出口管及び前記ＥＧＲ配管は、前記上流側の排気管側にそれぞれ配置されていることを特徴とする。 The present invention provides an exhaust heat recovery device connected to an upstream exhaust pipe and a downstream exhaust pipe through which exhaust gas flows, wherein a cooling medium flow path through which a cooling medium that exchanges heat with the exhaust gas circulates; a heat exchange portion having a heat exchange passage; and a main exhaust passage portion forming a main exhaust passage through which the exhaust gas flows from the downstream side exhaust pipe without flowing from the upstream side exhaust pipe to the heat exchange portion. and an EGR pipe forming a recirculation passage for flowing the exhaust gas from the heat exchange passage to the exhaust gas recirculation device on the intake side, and a switch for distributing the exhaust gas to the heat exchange passage and the main exhaust passage. a valve, wherein the heat exchange unit is provided with a cooling medium inlet pipe and a cooling medium outlet pipe for connecting the cooling medium flow path, and the cooling medium inlet pipe, the cooling medium outlet pipe, and the EGR pipe are It is characterized in that they are arranged respectively on the upstream side of the exhaust pipe.

本発明によれば、熱交換部の冷却媒体入口管と冷却媒体出口管及びＥＧＲ配管を上流側の排気管側にそれぞれ配置したことにより、装置の全長を短くすることができて小型化を図ることができ、かつ、車両の搭載性を向上させることができる。 According to the present invention, the cooling medium inlet pipe, the cooling medium outlet pipe, and the EGR pipe of the heat exchange section are arranged on the upstream side of the exhaust pipe, respectively, so that the overall length of the device can be shortened and the size can be reduced. In addition, the mountability of the vehicle can be improved.

本発明の一実施形態の排気熱回収装置を示す斜視図である。1 is a perspective view showing an exhaust heat recovery device according to one embodiment of the present invention; FIG. 上記排気熱回収装置の平面図である。FIG. 2 is a plan view of the exhaust heat recovery device; 上記排気熱回収装置の排熱回収モード時の断面図であり、（ａ）は図２中Ａ－Ａ線に沿う断面図、（ｂ）は図２中Ｂ－Ｂ線に沿う断面図である。FIG. 3 is a cross-sectional view of the exhaust heat recovery device in the exhaust heat recovery mode, where (a) is a cross-sectional view taken along the line AA in FIG. 2, and (b) is a cross-sectional view taken along the line BB in FIG. . 上記排気熱回収装置の排ガス再循環モード時の断面図であり、（ａ）は図２中Ａ－Ａ線に沿う断面図、（ｂ）は図２中Ｂ－Ｂ線に沿う断面図である。FIG. 3 is a cross-sectional view of the exhaust heat recovery device in the exhaust gas recirculation mode, where (a) is a cross-sectional view along line AA in FIG. 2, and (b) is a cross-sectional view along line BB in FIG. . 上記排気熱回収装置の排熱非回収モード時の断面図であり、（ａ）は図２中Ａ－Ａ線に沿う断面図、（ｂ）は図２中Ｂ－Ｂ線に沿う断面図である。FIG. 3 is a cross-sectional view of the exhaust heat recovery device in the exhaust heat non-recovery mode, where (a) is a cross-sectional view taken along the line AA in FIG. 2, and (b) is a cross-sectional view taken along the line BB in FIG. be.

以下、本発明の一実施形態を図面に基づいて説明する。 An embodiment of the present invention will be described below with reference to the drawings.

図１は本発明の一実施形態の排気熱回収装置を示す斜視図、図２は排気熱回収装置の平面図、図３は排気熱回収装置の排熱回収モード時の断面図であり、図３（ａ）は図２中Ａ－Ａ線に沿う断面図、図３（ｂ）は図２中Ｂ－Ｂ線に沿う断面図、図４は排気熱回収装置の排ガス再循環モード時の断面図であり、図４（ａ）は図２中Ａ－Ａ線に沿う断面図、図４（ｂ）は図２中Ｂ－Ｂ線に沿う断面図、図５は排気熱回収装置の排熱非回収モード時の断面図であり、図５（ａ）は図２中Ａ－Ａ線に沿う断面図、図５（ｂ）は図２中Ｂ－Ｂ線に沿う断面図である。 FIG. 1 is a perspective view showing an exhaust heat recovery device according to one embodiment of the present invention, FIG. 2 is a plan view of the exhaust heat recovery device, and FIG. 3 is a sectional view of the exhaust heat recovery device in an exhaust heat recovery mode. 3(a) is a cross-sectional view along line AA in FIG. 2, FIG. 3(b) is a cross-sectional view along line BB in FIG. 2, and FIG. 4 is a cross-sectional view of the exhaust heat recovery device in the exhaust gas recirculation mode. 4(a) is a cross-sectional view along line AA in FIG. 2, FIG. 4(b) is a cross-sectional view along line BB in FIG. 2, and FIG. 5 is exhaust heat of the exhaust heat recovery device. 5(a) is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 5(b) is a cross-sectional view taken along the line BB in FIG. 2. FIG.

図１に示すように、排気熱回収装置１０は、排ガス再循環装置（ＥＧＲ）を備えたエンジン（内燃機関）５５から排出される排ガスＧが流れる上流側の排気管１８と下流側の排気管１９にそれぞれ接続される装置本体１１を有し、排ガスＧの熱を回収すると共に、排ガスＧをエンジン５５へ再循環させるための装置であり、図３に示す排ガスＧの熱回収を行う排熱回収モードと、図４に示す排ガスＧをエンジン５５へ再循環させる排ガス再循環モードと、図５に示す熱回収を行わない排熱非回収モードと、を有する。 As shown in FIG. 1, the exhaust heat recovery device 10 includes an upstream exhaust pipe 18 and a downstream exhaust pipe through which exhaust gas G discharged from an engine (internal combustion engine) 55 equipped with an exhaust gas recirculation device (EGR) flows. 19, which is a device for recovering the heat of the exhaust gas G and recirculating the exhaust gas G to the engine 55. Exhaust heat for recovering the heat of the exhaust gas G shown in FIG. It has a recovery mode, an exhaust gas recirculation mode in which the exhaust gas G is recirculated to the engine 55 shown in FIG. 4, and an exhaust heat non-recovery mode in which heat recovery is not performed shown in FIG.

図１～図５に示すように、排気熱回収装置１０の装置本体１１は、排ガスＧをガス導入口２１からガス排出口２２に流す排ガス主排気流路２３を形成する主排気流路部２０と、排ガスＧが主排気流路部２０から分岐して冷却水（冷却媒体）Ｗと熱交換を行う冷却媒体の冷却媒体流路３２と排ガスＧの熱交換流路３３を形成する熱交換器３１を有する熱交換部３０と、この熱交換部３０の熱交換流路３３の下流側と主排気流路２３を結ぶ熱交換部３０下流側のガス流路４１を形成する合流部４０と、この合流部４０に流れる排ガスＧを吸気側のエンジン５５に流す再循環流路５１を形成するＥＧＲ配管５０と、主排気流路２３と熱交換流路３３とに排ガスＧを振り分ける切換えバルブ６０と、を備えている。 As shown in FIGS. 1 to 5, the device body 11 of the exhaust heat recovery device 10 includes a main exhaust passage portion 20 that forms an exhaust gas main exhaust passage 23 for flowing the exhaust gas G from the gas introduction port 21 to the gas discharge port 22. A heat exchanger that forms a cooling medium flow path 32 for a cooling medium in which the exhaust gas G branches from the main exhaust flow path portion 20 and exchanges heat with the cooling water (cooling medium) W and a heat exchange flow path 33 for the exhaust gas G. 31, a confluence portion 40 forming a gas flow path 41 on the downstream side of the heat exchange section 30 connecting the downstream side of the heat exchange flow path 33 of the heat exchange section 30 and the main exhaust flow path 23, an EGR pipe 50 forming a recirculation flow path 51 for flowing the exhaust gas G flowing in the confluence 40 to the engine 55 on the intake side; , is equipped with

切換えバルブ６０と図示しない排ガス再循環装置側に設けられたバルブより排ガスＧの流れモードが以下のように切換する。 The flow mode of the exhaust gas G is switched as follows by the switching valve 60 and a valve provided on the side of the exhaust gas recirculation device (not shown).

排熱非回収モード時に、主排気流路２３と熱交換流路３３が開放されて、熱交換部３０下流側のガス流路４１と再循環流路５１が閉じられる。排熱回収モード時に、主排気流路２３と再循環流路５１が閉じられて、熱交換流路３と熱交換部３０下流側のガス流路４１が開放される。排ガス再循環モード時に、主排気流路２３と熱交換部３０下流側のガス流路４１が閉じられて、熱交換流路３３と再循環流路５１が開放される。 During the exhaust heat non-recovery mode, the main exhaust flow path 23 and the heat exchange flow path 33 are opened, and the gas flow path 41 and the recirculation flow path 51 on the downstream side of the heat exchange section 30 are closed. During the exhaust heat recovery mode, the main exhaust flow path 23 and the recirculation flow path 51 are closed, and the heat exchange flow path 3 and the gas flow path 41 on the downstream side of the heat exchange section 30 are opened. During the exhaust gas recirculation mode, the main exhaust channel 23 and the gas channel 41 on the downstream side of the heat exchange section 30 are closed, and the heat exchange channel 33 and the recirculation channel 51 are opened.

図１、図２に示すように、装置本体１１は、一側面の下段側に位置して主排気流路２３を成す第１筐体１２と、この第１筐体１２上（一側面の上段側）に位置して合流部４０を成す第２筐体１３と、これら第１筐体１２及び第２筐体１３に併設され、他側面側に位置して熱交換部３０を成す第３筐体１４と、第２筐体１３と第３筐体１４の各上面開口側を覆って各筐体１３，１４をブロック状に組み付ける上蓋部１５（尚、第２筐体１３と上蓋部１５は一体部品でも良い）と、第１筐体１２と第３筐体１４の各下面開口側を覆って各筐体１２，１４をブロック状に組み付ける下蓋部１６（尚、下蓋部１６は２分割でも良い）と、で構成されている。尚、第３筐体１４の側面には、後述するアクチュエータ６５をボルト６６とナット６７を介して締結固定するアクチュエータ取付用筐体１７が取り付けられている。 As shown in FIGS. 1 and 2, the apparatus main body 11 includes a first housing 12 located on the lower side of one side and forming a main exhaust flow path 23, and a first housing 12 on the first housing 12 (upper side on the one side). A second housing 13 positioned on the side) and forming a confluence portion 40, and a third housing provided side by side with the first housing 12 and the second housing 13 and forming a heat exchange portion 30 positioned on the other side. A body 14 and an upper lid portion 15 that covers the top opening sides of the second housing 13 and the third housing 14 and assembles the housings 13 and 14 in a block shape (the second housing 13 and the upper lid portion 15 are and a lower lid portion 16 that covers the opening sides of the lower surfaces of the first housing 12 and the third housing 14 and assembles the housings 12 and 14 in a block shape (the lower lid portion 16 has two parts). It may be divided) and On the side surface of the third housing 14, an actuator mounting housing 17 for fastening and fixing an actuator 65 (to be described later) via bolts 66 and nuts 67 is attached.

図１に示すように、主排気流路２３のガス導入口２１とガス排出口２２は円筒状に形成されていると共に、ガス導入口２１とガス排出口２２以外の主排気流路２３は四角筒状或いは円筒状に形成されている。そして、ガス導入口２１には上流側の排気管１８が接続され、ガス排出口２２には下流側の排気管１９が接続される。 As shown in FIG. 1, the gas introduction port 21 and the gas discharge port 22 of the main exhaust passage 23 are formed in a cylindrical shape, and the main discharge passage 23 other than the gas introduction port 21 and the gas discharge port 22 is rectangular. It is formed in a tubular or cylindrical shape. An upstream exhaust pipe 18 is connected to the gas inlet 21 , and a downstream exhaust pipe 19 is connected to the gas outlet 22 .

図３（ｂ）、図４（ｂ）、図５（ｂ）に示すように、熱交換部３０の冷却水（冷却媒体）Ｗが循環する冷却媒体流路３２と排ガスＧの熱交換流路３３とで熱交換器３１になっている。 As shown in FIGS. 3(b), 4(b), and 5(b), a cooling medium flow path 32 through which the cooling water (cooling medium) W of the heat exchange section 30 circulates and a heat exchange flow path of the exhaust gas G 33 constitutes a heat exchanger 31 .

また、図１～図５に示すように、熱交換部３０には、冷却媒体流路３２の上流端側に接続される冷却媒体入口管３４と、冷却媒体流路３２の下流端側に接続される冷却媒体出口管３５がそれぞれ設けられている。熱交換器３１は、例えばアルミ材などの複数枚金属板より積層配置で構成され、筐体１２の排ガスＧの流れ方向に対して熱交換部３０の中に縦置き配置している。そして、冷却媒体入口管３４から流入した冷却水（冷却媒体）Ｗが、図３（ｂ）に示すように、熱交換部３０の中に排ガスＧの流れ方向（熱交換器３１の下側から上側に指す矢印）と同じ流れ方向で熱交換器３１の下側から上側に流れながら排ガスＧと熱交換を行い、冷却媒体出口管３５より流出する。これら冷却媒体入口管３４と冷却媒体出口管３５及びＥＧＲ配管５０は、装置本体１１の前面側である上流側の排気管１８側にそれぞれ配置されている。さらに、ＥＧＲ配管５０は、熱交換部３０より排ガスＧの下流側に配置されている。つまり、装置本体１１の前面側から見た時に、冷却媒体入口管３４と冷却媒体出口管３５が筐体１２の入口部分の右側に縦並びに配置してあると共に、ＥＧＲ配管５０が筐体１２のガス導入口１２の上側に配置してある。詳述すると、主排気流路２３の排ガスＧの流れ方向から装置本体１１を見たときに、熱交換部３０は、主排気流路部２０を囲むように水平領域と垂直領域を有するコ字状となっており、ＥＧＲ配管５０の合流部４０の接続位置は、主排気流路部２０と縦配置になって、コ字状の水平領域にあり、冷却媒体入口管３４と冷却媒体出口管３５の熱交換部３０との接続位置は、お互い縦配置になって、コ字状の垂直領域にある。 As shown in FIGS. 1 to 5, the heat exchange unit 30 includes a cooling medium inlet pipe 34 connected to the upstream end side of the cooling medium flow path 32 and a cooling medium inlet pipe 34 connected to the downstream end side of the cooling medium flow path 32. A cooling medium outlet pipe 35 is provided for each. The heat exchanger 31 is configured by stacking a plurality of metal plates such as aluminum, and is arranged vertically in the heat exchange section 30 with respect to the flow direction of the exhaust gas G in the housing 12 . Then, as shown in FIG. 3B, the cooling water (cooling medium) W flowing from the cooling medium inlet pipe 34 flows into the heat exchange section 30 in the flow direction of the exhaust gas G (from the bottom side of the heat exchanger 31). The coolant exchanges heat with the exhaust gas G while flowing from the lower side to the upper side of the heat exchanger 31 in the same flow direction as the arrow pointing upward), and flows out from the cooling medium outlet pipe 35 . The cooling medium inlet pipe 34 , the cooling medium outlet pipe 35 and the EGR pipe 50 are arranged on the upstream exhaust pipe 18 side, which is the front side of the device main body 11 . Furthermore, the EGR pipe 50 is arranged downstream of the exhaust gas G from the heat exchange section 30 . That is, when viewed from the front side of the apparatus main body 11, the cooling medium inlet pipe 34 and the cooling medium outlet pipe 35 are arranged vertically on the right side of the inlet portion of the housing 12, and the EGR pipe 50 is located in the housing 12. It is arranged above the gas inlet 12 . More specifically, when the apparatus main body 11 is viewed from the flow direction of the exhaust gas G in the main exhaust passage 23, the heat exchange section 30 has a U-shape having a horizontal region and a vertical region so as to surround the main exhaust passage 20. The connection position of the confluence portion 40 of the EGR pipe 50 is arranged vertically with the main exhaust passage portion 20 and is located in a U-shaped horizontal region, and the cooling medium inlet pipe 34 and the cooling medium outlet pipe The connection position of 35 with the heat exchanging part 30 is arranged vertically with each other and is in a U-shaped vertical region.

さらに、図３（ｂ）に示すように、熱交換部３０には、排ガスＧが主排気流路２３から熱交換流路３３に流入する熱交換部ガス流入部３７と、排ガスＧが熱交換流路３３から合流部４０に流出する熱交換部ガス流出部３８とがそれぞれ設けられている。この熱交換部ガス流入部３７は、冷却媒体入口管３４側（下側）に配置され、熱交換部ガス流出部３８は、冷却媒体出口管３５側（上側）に配置されている。図３（ａ），（ｂ）に示すように、熱交換部３０の一部は主排気流路２３の下側まで延びていて、熱交換部３０の熱交換部ガス流入部３７の入口部３６と主排気流路２３の下側に形成された開口部２４とは連通している。さらに、熱交換部３０の上部は熱交換部ガス流出部３８を介して合流部４０と連通している。 Further, as shown in FIG. 3B, the heat exchange section 30 includes a heat exchange section gas inflow section 37 through which the exhaust gas G flows from the main exhaust flow path 23 into the heat exchange flow path 33, A heat exchanging portion gas outflow portion 38 that flows out from the flow path 33 to the confluence portion 40 is provided. The heat exchanging part gas inflow part 37 is arranged on the cooling medium inlet pipe 34 side (lower side), and the heat exchanging part gas outflow part 38 is arranged on the cooling medium outlet pipe 35 side (upper side). As shown in FIGS. 3A and 3B, part of the heat exchange section 30 extends to the lower side of the main exhaust flow path 23, and the inlet portion of the heat exchange section gas inflow section 37 of the heat exchange section 30 36 and the opening 24 formed below the main exhaust passage 23 communicate with each other. Furthermore, the upper portion of the heat exchange section 30 communicates with the junction section 40 via the heat exchange section gas outlet section 38 .

図１、図３～図５に示すように、主排気流路部２０を成す第２筐体１３の前面には、再循環流路５１を形成するＥＧＲ配管５０が設けられている。このＥＧＲ配管５０の先端には、エンジン５５から延びる排気管５３を接続するための取付フランジ５２が取り付けられている。 As shown in FIGS. 1 and 3 to 5 , an EGR pipe 50 forming a recirculation flow path 51 is provided on the front surface of the second housing 13 forming the main exhaust flow path section 20 . A mounting flange 52 for connecting an exhaust pipe 53 extending from an engine 55 is attached to the tip of the EGR pipe 50 .

さらに、図３（ａ）、図４（ａ）、図５（ａ）に示すように、主排気流路２３と合流部４０のガス流路４１の下流側の合流位置には、連通口２５，４５がそれぞれ設けられている。これら各連通口２５，４５と主排気流路２３を切換えバルブ６０により開閉することで、排ガスＧが主排気流路２３と熱交換流路３３とに振り分けられるようになっている。 Furthermore, as shown in FIGS. 3A, 4A, and 5A, a communication port 25 is provided at the confluence position downstream of the gas flow path 41 of the main exhaust flow path 23 and the confluence portion 40. , 45 are provided respectively. By opening and closing the communication ports 25 and 45 and the main exhaust passage 23 with the switching valve 60 , the exhaust gas G is distributed to the main exhaust passage 23 and the heat exchange passage 33 .

図３（ａ）、図４（ａ）、図５（ａ）に示すように、切換えバルブ６０は、主排気流路２３を開閉するバタフライバルブ部６１と、主排気流路２３と合流部４０のガス流路４１の各連通口２５，４５を開閉するシャッタバルブ部６２と、を有している。このバタフライバルブ部６１とシャッタバルブ部６２とは、折り曲げ形成等により所定の間隔を有して平行に設けられている。また、バタフライバルブ部６１はシャッタバルブ部６２より大形に形成されている。このバタフライバルブ部６１より小形のシャッタバルブ部６２が主排気流路２３と合流部４０のガス流路４１の各連通口２５，４５を閉じると、大形のバタフライバルブ部６１が主排気流路２３を開くようになっている。そして、バタフライバルブ部６１の中央に固定された駆動軸６３がアクチュエータ６５により回動することにより、切換えバルブ６０が揺動するようになっている。この切換えバルブ６０の揺動により、図３（ａ）に示すように、バタフライバルブ部６１で主排気流路２３が閉状態の場合に、シャッタバルブ部６２が主排気流路２３と合流部４０のガス流路４１の各連通口２５，４５を開状態にし、また、図４（ａ）及び図５（ａ）に示すように、バタフライバルブ部６１で主排気流路２３が開状態の場合に、シャッタバルブ部６２が主排気流路２３と合流部４０のガス流路４１の各連通口２５，４５を閉状態に切換えるようになっている。 As shown in FIGS. 3(a), 4(a), and 5(a), the switching valve 60 includes a butterfly valve portion 61 that opens and closes the main exhaust passage 23, and a shutter valve portion 62 for opening and closing the communication ports 25 and 45 of the gas flow path 41 . The butterfly valve portion 61 and the shutter valve portion 62 are provided parallel to each other with a predetermined interval by bending or the like. Also, the butterfly valve portion 61 is formed larger than the shutter valve portion 62 . When the shutter valve portion 62, which is smaller than the butterfly valve portion 61, closes the communication ports 25, 45 of the main exhaust passage 23 and the gas passage 41 of the confluence portion 40, the large butterfly valve portion 61 closes the main exhaust passage. 23 is to be opened. When the drive shaft 63 fixed to the center of the butterfly valve portion 61 is rotated by the actuator 65, the switching valve 60 swings. By swinging the switching valve 60, as shown in FIG. When the communication ports 25, 45 of the gas flow path 41 are opened, and the main exhaust flow path 23 is opened by the butterfly valve portion 61 as shown in FIGS. 4(a) and 5(a) In addition, the shutter valve portion 62 switches the communication ports 25 and 45 of the main exhaust flow channel 23 and the gas flow channel 41 of the confluence portion 40 to a closed state.

以上実施形態の排気熱回収装置１０によれば、図３（ａ），（ｂ）に示すように、排熱回収モードでは、切換えバルブ６０のバタフライバルブ部６１で主排気流路２３が全閉され、切換えバルブ６０のシャッタバルブ部６２で主排気流路２３と合流部４０のガス流路４１の各連通口２５，４５が全開されている。この状態で、エンジン５５から排出されて上流側の排気管１８より流れて来た排ガスＧは、主排気流路２３の下側の開口部２４から熱交換部ガス流入部３７に流れ、熱交換部ガス流入部３７から熱交換器３１と熱交換部ガス流出部３８を通り、熱交換部ガス流出部３８から合流部４０のガス流路４１を経由して、合流部４０のガス流路４１と主排気流路２３の各連通口４５，２５から主排気流路２３を通って下流側の排気管１９へ流れる。そして、エンジン５５から排出された排ガスＧが熱交換器３１の熱交換流路３３を通る際に、熱交換器３１の冷却媒体流路３２を通る冷却水Ｗとの熱交換が行われて排熱が回収される。 According to the exhaust heat recovery device 10 of the embodiment described above, as shown in FIGS. Communicating ports 25 and 45 of the main exhaust channel 23 and the gas channel 41 of the confluence portion 40 are fully opened by the shutter valve portion 62 of the switching valve 60 . In this state, the exhaust gas G discharged from the engine 55 and flowing from the exhaust pipe 18 on the upstream side flows from the opening 24 on the lower side of the main exhaust passage 23 to the heat exchanging part gas inflow part 37 to exchange heat. From the gas inlet portion 37, through the heat exchanger 31 and the heat exchange portion gas outlet portion 38, from the heat exchange portion gas outlet portion 38, through the gas passage 41 of the junction portion 40, the gas passage 41 of the junction portion 40 , and flows through the main exhaust passage 23 from the communication ports 45 and 25 of the main exhaust passage 23 to the exhaust pipe 19 on the downstream side. When the exhaust gas G discharged from the engine 55 passes through the heat exchange passage 33 of the heat exchanger 31, heat is exchanged with the cooling water W passing through the cooling medium passage 32 of the heat exchanger 31, and the exhaust gas G is exhausted. heat is recovered.

また、図４（ａ），（ｂ）に示すように、排ガス再循環モードでは、切換えバルブ６０のバタフライバルブ部６１で主排気流路２３が全開され、切換えバルブ６０のシャッタバルブ部６２で主排気流路２３と合流部４０のガス流路４１の各連通口２５，４５が全閉されている。この状態で、エンジン５５から排出されて上流側の排気管１８より流れて来た排ガスＧは、バタフライバルブ部６１で全開されている主排気流路２３を通って下流側の排気管１９へ流れる。この際、ＥＧＲ配管５０とエンジン５５を接続する排気管５３に設けられた図示しないバルブを開状態にすると、排気管５３側の負圧により、一部の排ガスＧ１が主排気流路２３の下側の開口部２４から熱交換部ガス流入部３７に流れ、熱交換部ガス流入部３７から熱交換器３１と熱交換部ガス流出部３８を通り、熱交換部ガス流出部３８から合流部４０のガス流路４１を経由して、ＥＧＲ配管５０の再循環流路５１に流れる。これにより、熱交換器３１で冷却水Ｗとの熱交換が行われて排熱が回収されると共に、エンジン５５に排ガスＧ１が再循環されて燃費の改善が図られる。 4(a) and 4(b), in the exhaust gas recirculation mode, the butterfly valve portion 61 of the switching valve 60 fully opens the main exhaust passage 23, and the shutter valve portion 62 of the switching valve 60 opens the main exhaust passage. The communication ports 25, 45 of the gas flow path 41 of the exhaust flow path 23 and the confluence portion 40 are fully closed. In this state, the exhaust gas G discharged from the engine 55 and flowing from the exhaust pipe 18 on the upstream side passes through the main exhaust passage 23 which is fully opened by the butterfly valve portion 61 and flows to the exhaust pipe 19 on the downstream side. . At this time, when a valve (not shown) provided in an exhaust pipe 53 that connects the EGR pipe 50 and the engine 55 is opened, a part of the exhaust gas G1 is pushed downward under the main exhaust passage 23 due to the negative pressure on the exhaust pipe 53 side. It flows from the opening 24 on the side to the heat exchanging part gas inlet 37 , passes through the heat exchanger 31 and the heat exchanging part gas outlet 38 from the heat exchanging part gas inlet 37 , and flows from the heat exchanging part gas outlet 38 to the merging part 40 . , into the recirculation flow path 51 of the EGR pipe 50 . As a result, heat is exchanged with the cooling water W in the heat exchanger 31 to recover exhaust heat, and the exhaust gas G1 is recirculated to the engine 55 to improve fuel efficiency.

さらに、図５（ａ），（ｂ）に示すように、排熱非回収モードでは、切換えバルブ６０のバタフライバルブ部６１で主排気流路２３が全開され、切換えバルブ６０のシャッタバルブ部６２で主排気流路２３と合流部４０のガス流路４１の各連通口２５，４５が全閉されている。この状態で、エンジン５５から排出されて上流側の排気管１８より流れて来た排ガスＧは、バタフライバルブ部６１で全開されている主排気流路２３を通って下流側の排気管１９へ流れる。この際、排ガスＧは熱交換器３１の熱交換流路３３を通らないため、排熱は回収されない。さらに、排気管５３に設けられたバルブは閉状態であるため、排ガスＧは、ＥＧＲ配管５０の再循環流路５１からエンジン５５へ再循環しない。 Further, as shown in FIGS. 5A and 5B, in the exhaust heat non-recovery mode, the butterfly valve portion 61 of the switching valve 60 fully opens the main exhaust passage 23, and the shutter valve portion 62 of the switching valve 60 The communication ports 25, 45 of the main exhaust flow path 23 and the gas flow path 41 of the junction 40 are fully closed. In this state, the exhaust gas G discharged from the engine 55 and flowing from the exhaust pipe 18 on the upstream side passes through the main exhaust passage 23 which is fully opened by the butterfly valve portion 61 and flows to the exhaust pipe 19 on the downstream side. . At this time, since the exhaust gas G does not pass through the heat exchange passage 33 of the heat exchanger 31, exhaust heat is not recovered. Furthermore, since the valve provided in the exhaust pipe 53 is closed, the exhaust gas G is not recirculated from the recirculation flow path 51 of the EGR pipe 50 to the engine 55 .

また、排気熱回収装置１０によれば、図１に示すように、熱交換部３０の冷却媒体入口管３４と冷却媒体出口管３５及びＥＧＲ配管５０を上流側の排気管１８側にそれぞれ配置し、また、切換えバルブ６０を駆動させるアクチュエータ６５を装置本体１１の熱交換部３０を成す第３筐体１４の側面に取り付けたことにより、装置の全長及び横幅を短くすることができて小型化を図ることができ、かつ、車両の搭載性を向上させることができる。 Also, according to the exhaust heat recovery device 10, as shown in FIG. In addition, by attaching the actuator 65 for driving the switching valve 60 to the side surface of the third housing 14 forming the heat exchange section 30 of the device main body 11, the overall length and width of the device can be shortened and the size can be reduced. In addition, the mountability of the vehicle can be improved.

また、熱交換部３０の熱交換流路３３の開口面積が広く取れるため、通気抵抗を低くできる。さらに、切換えバルブ６０がバタフライバルブ部６１とシャッタバルブ部６２を有しているため、スペースを有効に活用することができ、主排気流路２３のみで対応が可能である。 Moreover, since the opening area of the heat exchange flow path 33 of the heat exchange part 30 can be widened, airflow resistance can be made low. Furthermore, since the switching valve 60 has the butterfly valve portion 61 and the shutter valve portion 62, the space can be effectively utilized, and the main exhaust passage 23 alone can be used.

さらに、熱交換部３０とアクチュエータ６５を隣接して配置することで、排ガスエネルギーが高く高温のエキゾーストマニホールド直下の位置でも搭載が可能になる。また、排ガス温度が高い部分を効率的に冷却することができ、熱交換器３１の耐沸騰性を向上させることができる。 Furthermore, by arranging the heat exchange part 30 and the actuator 65 adjacently, it is possible to mount them even at a position directly below the exhaust manifold where the exhaust gas energy is high and the temperature is high. Moreover, the part where the exhaust gas temperature is high can be efficiently cooled, and the boiling resistance of the heat exchanger 31 can be improved.

尚、前記実施形態によれば、冷却媒体として冷却水を用いたが、冷却媒体は冷却水以外でも良い。 Incidentally, according to the above embodiment, cooling water is used as the cooling medium, but the cooling medium may be other than cooling water.

１０ 排気熱回収装置
１１ 装置本体
１８ 上流側の排気管
１９ 下流側の排気管
２０ 主排気流路部
２１ ガス導入口
２２ ガス排出口
２３ 主排気流路
２４ 開口部
２５ 連通口
３０ 熱交換部
３２ 冷却媒体流路
３３ 熱交換流路
３４ 冷却媒体入口管
３５ 冷却媒体出口管
３７ 熱交換部ガス流入部
３８ 熱交換部ガス流出部
４０ 合流部
４１ 熱交換部下流のガス流路
４５ 連通口
５０ ＥＧＲ配管
５１ 再循環流路
５５ 排ガス再循環装置（ＥＧＲ）を備えたエンジン（内燃機関）
６０ 切換えバルブ
６１ バタフライバルブ部
６２ シャッタバルブ部
６３ 駆動軸
Ｇ，Ｇ１ 排ガス
Ｗ 冷却水（冷却媒体） REFERENCE SIGNS LIST 10 exhaust heat recovery device 11 device main body 18 upstream exhaust pipe 19 downstream exhaust pipe 20 main exhaust passage portion 21 gas introduction port 22 gas discharge port 23 main exhaust passage 24 opening 25 communication port 30 heat exchange portion 32 Cooling medium flow path 33 Heat exchange flow path 34 Cooling medium inlet pipe 35 Cooling medium outlet pipe 37 Heat exchange section gas inlet 38 Heat exchange section gas outlet 40 Junction section 41 Gas flow path downstream of heat exchange section 45 Communication port 50 EGR Piping 51 Recirculation channel 55 Engine with exhaust gas recirculation (EGR) (internal combustion engine)
60 switching valve 61 butterfly valve section 62 shutter valve section 63 drive shaft G, G1 exhaust gas W cooling water (cooling medium)

Claims (5)

排ガス再循環装置を備えた内燃機関からの排ガスが導かれる排気管に設置されるガス導入口とガス排出口を有する排気熱回収装置において、
前記排ガスが前記ガス導入口から前記ガス排出口に向かって流れる主排気流路を有する主排気流路部と、
前記主排気流路部に併設され前記主排気流路から分流した排ガスが冷却媒体と熱交換を行う熱交換流路を有する熱交換部と、
を備え、
前記熱交換部は、前記冷却媒体が流れる冷却媒体流路を有する熱交換器と、前記排ガスを前記熱交換流路から前記主排気流路部と前記排ガス再循環装置に分流する合流部より構成され、
前記主排気流路の排ガスの流れ方向における前記合流部の端部に前記排ガスが前記合流部から前記排ガス再循環装置に導入するＥＧＲ配管が設けられ、
前記主排気流路の排ガスの流れる方向における前記熱交換部の端部に前記冷却媒体流路を構成する冷却媒体入口管と冷却媒体出口管が設けられ、
前記主排気流路の排ガスの流れ方向から装置本体を見たときに、前記熱交換部は、前記主排気流路部を囲むように水平領域と垂直領域を有するコ字状となっており、
前記ＥＧＲ配管の前記合流部の接続位置は、前記主排気流路部と縦配置になって、前記コ字状の水平領域にあり、
前記冷却媒体入口管と前記冷却媒体出口管の前記熱交換部との接続位置は、お互い縦配置になって、前記コ字状の垂直領域にあることを特徴とする排気熱回収装置。 An exhaust heat recovery device having a gas inlet and a gas outlet installed in an exhaust pipe through which exhaust gas from an internal combustion engine equipped with an exhaust gas recirculation device is guided,
a main exhaust passage portion having a main exhaust passage through which the exhaust gas flows from the gas introduction port toward the gas discharge port;
a heat exchange section that is provided alongside the main exhaust flow path and has a heat exchange flow path that exchanges heat between the exhaust gas branched from the main exhaust flow path and a cooling medium;
with
The heat exchange section is composed of a heat exchanger having a cooling medium flow path through which the cooling medium flows, and a confluence section that divides the exhaust gas from the heat exchange flow path into the main exhaust flow path section and the exhaust gas recirculation device. is,
An EGR pipe for introducing the exhaust gas from the confluence portion to the exhaust gas recirculation device is provided at an end of the confluence portion in the exhaust gas flow direction of the main exhaust passage,
A cooling medium inlet pipe and a cooling medium outlet pipe constituting the cooling medium flow path are provided at an end of the heat exchange section in the direction in which the exhaust gas flows in the main exhaust flow path,
When the device body is viewed from the flow direction of the exhaust gas in the main exhaust passage, the heat exchange section has a U-shape having a horizontal region and a vertical region so as to surround the main exhaust passage,
A connection position of the confluence portion of the EGR pipe is arranged vertically with the main exhaust passage portion and is in the U-shaped horizontal region,
An exhaust heat recovery system according to claim 1, wherein the cooling medium inlet pipe and the cooling medium outlet pipe are connected to the heat exchanging portion in a vertical region of the U-shape. 請求項１記載の排気熱回収装置であって、
前記熱交換部に、前記排ガスが前記主排気流路から前記熱交換流路に流入する熱交換部ガス流入部と、前記排ガスが前記熱交換流路から前記熱交換器下流のガス流路に流出する熱交換部ガス流出部と、がそれぞれ設けられ、
前記熱交換部ガス流入部は、前記冷却媒体入口管側に配置され、前記熱交換部ガス流出部は、前記冷却媒体出口管側に配置されていることを特徴とする排気熱回収装置。 The exhaust heat recovery device according to claim 1,
The heat exchange section includes a heat exchange section gas inlet section through which the exhaust gas flows from the main exhaust flow path into the heat exchange flow path, and a gas flow path downstream of the heat exchanger from the heat exchange flow path. and an outflowing heat exchange part gas outflow part are provided,
The exhaust heat recovery device, wherein the heat exchanging part gas inflow part is arranged on the cooling medium inlet pipe side, and the heat exchanging part gas outflow part is arranged on the cooling medium outlet pipe side. 請求項１記載の排気熱回収装置であって、
前記合流部に前記排ガスを前記合流部から前記主排気流路に戻す連通口が設けられ、
前記主排気流路部に前記排ガスが前記熱交換部に分流される開口部が設けられ、
前記開口部より前記主排気流路部の下流側に設けられて前記主排気流路及び前記熱交換流路を開閉する切換えバルブがあって、
前記切換えバルブは、前記主排気流路を開閉するバタフライバルブ部と前記連通口を開閉するシャッタバルブ部とを有して、前記バタフライバルブ部に設けられる駆動軸で回動できるように前記主排気流路部に固定され、
前記排ガスを前記熱交換流路と前記主排気流路とに振り分けることを特徴とする排気熱回収装置。 The exhaust heat recovery device according to claim 1,
A communication port is provided in the junction for returning the exhaust gas from the junction to the main exhaust flow path,
an opening through which the exhaust gas is diverted to the heat exchanging portion is provided in the main exhaust passage portion;
a switching valve provided on the downstream side of the main exhaust passage from the opening for opening and closing the main exhaust passage and the heat exchange passage,
The switching valve has a butterfly valve portion that opens and closes the main exhaust flow path and a shutter valve portion that opens and closes the communication port. fixed to the flow channel,
An exhaust heat recovery device, wherein the exhaust gas is divided between the heat exchange channel and the main exhaust channel. 請求項１記載の排気熱回収装置であって、
前記主排気流路の排ガスの流れ方向における前記合流部の前記排ガスの上流側の端部に前記排ガスが前記合流部から前記排ガス再循環装置に導入するＥＧＲ配管が設けられ、
前記主排気流路の排ガスの流れ方向における前記熱交換部の上流側の端部に前記冷却媒体入口管と冷却媒体出口管が設けられていることを特徴とする排気熱回収装置。 The exhaust heat recovery device according to claim 1,
An EGR pipe for introducing the exhaust gas from the confluence portion to the exhaust gas recirculation device is provided at an upstream end of the exhaust gas of the confluence portion in the exhaust gas flow direction of the main exhaust passage,
The exhaust heat recovery device, wherein the cooling medium inlet pipe and the cooling medium outlet pipe are provided at an upstream end of the heat exchange section in the exhaust gas flow direction of the main exhaust passage. 請求項１～４のいずれか１項に記載の排気熱回収装置であって、
前記ＥＧＲ配管は、前記熱交換部より前記排ガスの下流側に配置されていることを特徴とする排気熱回収装置。 The exhaust heat recovery device according to any one of claims 1 to 4,
The exhaust heat recovery device, wherein the EGR pipe is arranged downstream of the exhaust gas from the heat exchange section.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012184680A (en) 2011-03-03 2012-09-27 Yutaka Giken Co Ltd Exhaust heat recovery device
JP2013142361A (en) 2012-01-12 2013-07-22 Calsonic Kansei Corp Heat exchange unit
JP2015148160A (en) 2014-02-05 2015-08-20 株式会社三五 Exhaust heat recovery device
JP2016044666A (en) 2014-08-27 2016-04-04 株式会社三五 Exhaust heat recovery device of internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012184680A (en) 2011-03-03 2012-09-27 Yutaka Giken Co Ltd Exhaust heat recovery device
JP2013142361A (en) 2012-01-12 2013-07-22 Calsonic Kansei Corp Heat exchange unit
JP2015148160A (en) 2014-02-05 2015-08-20 株式会社三五 Exhaust heat recovery device
JP2016044666A (en) 2014-08-27 2016-04-04 株式会社三五 Exhaust heat recovery device of internal combustion engine

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